A basin evolution synthesis and an integration of geological and geophysical data, relevant as guides to the exploration of gold and lead–zinc deposits in the Itajaı´Basin, are presented in this paper. The Itajaı´Basin is interpreted as a collision-related foreland basin consisting of weakly metamorphosed sediments deposited between the structural front of the Dom Feliciano fold and thrust belt and the proximal ﬂank of the cratonic forebulge. Its sediments represent a second-order depositional sequence deposited during a foreland transgression–regression cycle related to ﬂexural subsidence. After deposition, the basin underwent a main late-collisional compressional deformation phase followed by an extensional post-orogenic relaxation. Known gold and lead–zinc deposits are associated with late-orogenic faulting of the Itajaı´Basin sediments. The gold-bearing quartz veins are of ﬁlonean hydrothermal aYliation, while the lead–zinc deposits were formed by solution-remobilization in a meteoric–connate–magmatic mineralizing ﬂuid. Major trends of favourability for such deposits are recognized. The most favourable sites for lead–zinc deposits are near known mineralized areas and also along a NE-orientated fault at the margin adjacent to the Dom Feliciano metamorphic belt. The higher favourability for gold deposits is assigned to an area along the same NE trend, and also around a small known deposit near the cratonic margin.
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|Titolo:||Basin analysis and mineral endowment of the proterozoic Itajai' Basin, south- east Brazil|
|Citazione:||Carmignani, L., Rostirolla, S.P., Ahrendt, A., Soares, C., Coscini, N., Paranhos Flho, A., et al. (1999). Basin analysis and mineral endowment of the proterozoic Itajai' Basin, south- east Brazil. BASIN RESEARCH, 11(2), 127-142.|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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